4. You might be pregnant
One of the first changes to your body when you’re pregnant—and the most noticeable—is a sudden change to your sleeping habits and energy levels. Pregnancy has a serious impact on your body and feelings of fatigue during your first trimester are very common. If you normally stay up past midnight, then suddenly find yourself wanting to crash out at 9 pm, pregnancy could be a factor. Sleep can also be challenging for new moms, who suddenly have to adjust to the sleep schedule of their baby.