Sleep Deprivation in Pregnancy: Mood, Energy and Nausea

Q: Is it normal to feel this exhausted in the first trimester?

Yes. The sharp rise in progesterone, along with the work your body puts into building the placenta and making more blood, all add up to real tiredness in early pregnancy. Fatigue in the first trimester is one of the most common things you will feel, and it comes from genuine changes happening in your body.

Q: Can poor sleep make morning sickness worse?

Being worn out can make nausea and vomiting feel more intense. It runs the other way too: nausea and vomiting break up your sleep, leave you short on fluids, and drain your energy, which deepens the tiredness again. Resting when you can helps take the edge off both sides of this cycle.

Q: How do I know if my tiredness is something I should raise with my midwife or GP?

Ordinary pregnancy tiredness usually eases with rest and follows the trimester pattern, heaviest in the first and third. Tiredness that feels severe, hangs on, and does not lift with rest is worth raising. Call your GP or midwife too if your tiredness comes with persistent low mood, lightheadedness, extreme thirst, or fever. Chest pain or trouble breathing needs an immediate call to 999 or a trip to A&E.

Q: Can poor sleep during pregnancy affect my mental health?

Poor sleep during pregnancy lines up with a higher chance of anxiety and depression around birth. If sadness, anxiety, or low mood sticks around for more than a couple of weeks, or gets in the way of daily life, speak to your midwife or GP. You can also refer yourself to NHS Talking Therapies for support.

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From the first weeks of pregnancy, a heaviness can settle into your body that no amount of rest quite touches. Sleep deprivation in pregnancy has a real impact: it can deepen the nausea of early pregnancy, tip your mood towards irritability and low focus, and leave you with less in the tank for the day ahead. This article covers what is happening in your body, and how to tell when the tiredness you are carrying is worth raising with your midwife or GP.

Why pregnancy fatigue is so physical

The deep tiredness of the first trimester comes partly down to progesterone, the hormone that rises sharply in early pregnancy and pulls your energy down with it. At the same time, your body is building the placenta and making more blood to support the baby. That is a lot of work happening quietly in the background, and the tiredness it brings is real and expected. It tends to be strongest in the first trimester, ease off through the second, then come back in the third as the baby grows, and as getting comfortable or carrying the extra weight through the day gets harder.¹

How tiredness and nausea feed each other

In early pregnancy, tiredness and nausea tend to feed each other. When you are worn out, the nausea and vomiting can feel worse. And the nausea pulls the other way too: it drains your energy, leaves you short on fluids, and breaks up your sleep, which leaves you more tired again. The more nausea you have, the more drained you tend to feel, and the loop can be hard to break. Resting when you can is one of the simplest ways to take some pressure off the nausea side of it.²

How poor sleep affects your mood

When sleep is short night after night, your mood often takes the hit. Alongside the hormonal shifts of pregnancy and any anxiety you are carrying, poor sleep can leave you more irritable, less able to concentrate, and with a shorter fuse for the day. You may notice your usual capacity to cope feels thinner. This is common, and it is still worth paying attention to.³

Poor sleep over time also lines up with a higher chance of anxiety and depression during pregnancy and after birth. If you notice sadness, low mood, or anxiety that sticks around for more than a couple of weeks, or that gets in the way of daily life, it is worth speaking to your midwife or GP. Support is there through your maternity team and NHS Talking Therapies, which you can refer yourself to.⁴

Normal pregnancy tiredness and what is worth raising

Ordinary pregnancy tiredness tends to follow a pattern you can recognise. It is heaviest in the first trimester, usually lighter in the second, then back again in the third as the physical demands build. It comes from the hormonal and body changes of pregnancy, and although it can be heavy, it usually eases when you rest.⁵

Tiredness that feels severe, hangs on, and does not lift with rest is worth raising with your GP or midwife. A few underlying conditions can show up as unusual tiredness in pregnancy, and your care team can check whether anything else is going on.⁶

Symptoms that need prompt attention

Call your GP or midwife if your tiredness comes with any of the following:

Persistent low mood, hopelessness, or losing interest in things you usually enjoy (possible signs of depression)
Weakness or feeling lightheaded (possible signs of anaemia from low iron)
Extreme thirst and needing to pee more often than usual (possible signs linked to gestational diabetes)
Sudden tiredness that comes on with a fever⁷

If you are not sure whether what you are feeling is within the normal range, your midwife is the right first call. Raising it early gives your care team the chance to rule out underlying causes and get the right support in place.

Frequently Asked Questions

Is it normal to feel this exhausted in the first trimester?

Can poor sleep make morning sickness worse?

How do I know if my tiredness is something I should raise with my midwife or GP?

Can poor sleep during pregnancy affect my mental health?

Sources

[1] Tiredness and sleep problems in pregnancy

Normal pregnancy fatigue is very common in the first trimester, tends to ease during the second, and often returns in the third as the baby grows larger, making it physically harder to get comfortable and tiring to carry extra weight through the day.
[2] Tiredness and sleep problems in pregnancy

Nausea and vomiting can drain energy, cause dehydration, and disrupt sleep, which in turn leads to further fatigue. Higher levels of nausea are associated with higher levels of fatigue.
[3] Tiredness and sleep problems in pregnancy

Consistent sleep deprivation in pregnancy is a recognised contributor to mood swings, alongside hormonal changes and anxiety. You may notice increased irritability and difficulty concentrating.
[4] Tiredness and sleep problems in pregnancy

Poor sleep during pregnancy is associated with a higher risk of developing perinatal anxiety and depression. If feelings of sadness or anxiety persist for more than a few weeks or interfere with daily life, it is important to seek help.
[5] Tiredness and sleep problems in pregnancy

Normal pregnancy fatigue follows a recognisable pattern: prominent in the first trimester, generally lighter in the second, and returning in the third. It tends to respond to rest.
[6] Tiredness and sleep problems in pregnancy

Fatigue that is severe, persistent, and does not improve with rest is worth discussing with your GP or midwife.
[7] Tiredness and sleep problems in pregnancy

Fatigue accompanied by persistent low mood or hopelessness (possible depression), weakness or lightheadedness (possible anaemia), extreme thirst and frequent urination (possible gestational diabetes), or sudden fatigue with fever are all signs to contact a GP or midwife. Chest pain or difficulty breathing requires immediate emergency care.