dae get into periods where they sleep 16-18 hours a day for like a week straight and then go back to normal? 

i typically have a very regulated sleep/wake cycle but it seems every couple months i have a week where i just cannot stay awake no matter how hard i try. 

i have found that the best way to get through is to not fight it and just get the sleep my body wants. caffeine, exercise nor anything else keep me awake. i have to sleep.