Not every month, but just as a one off as I'm so exhausted. My period is due and no matter how much sleep I get, I'm completely exhausted. So tired that I can't concentrate, can't keep my eyes open properly after 5pm, move really slowly, am in bed at the same time as my toddler etc. I struggle to work and it's really getting to me. I'm not usually this bad but the last few months have got progressively worse. Would I be unreasonable to take a one off day off work? Also, does anyone else feel like this in the run up to their period? I feel awful.