Hi, I'm 26, 8stn 152cm female, generally healthy, even though I have been asleep for 8 or more hours I've woken up feeling really tired, my eyes are heavy, I have a headache, a dry mouth, I know I'm not dehydrated as I've been drinking water and I urinate a lot and it's not too dark in colour, I yawn lots throughout the day and tend to need a nap aswell, I've started drinking lots more coffee just to keep me awake (which then leaves me fidgety at night)
Any idea what can cause this.