Sudden feeling of fatigue?
No one knows for certain what causes fatigue and frequent sleepiness during pregnancy, but the rapid increase in progesterone likely plays a role. Morning sickness and the need to urinate frequently during the night may also add to your tiredness.
You should begin to feel more energetic once you enter the second trimester. However, fatigue often returns toward the end of pregnancy, as some common discomforts can make it more difficult to fall asleep.
