Please, no suggested solutions or reasons, we just need to get an idea of what "it is" so that a professional could give some sound medical advice. A family member has had a problem of going to sleep on Sunday nights only for over three years. These are some of the changes in her body she notices on Sunday's starting at about 1pm 1. A slight buzz feeling in the head (slight dizziness) - like high on Sunday afternoon 2. She gets really sleepy to the point of passing out Sunday around 2pm, but does not sleep 3. She's wide awake from the feeling of sleepiness around 7pm and stays away all night till approximately the next evening (Monday) when sleepiness is back to normal as if the night before was normal. 4. She might get really really really sleepy Sunday night around 11pm, but sleep does not come. She has heard every reason, and tried just about every suggestion known from professional, friends, co-workers, etc, which is why suggestions of resolving is not the question. If there is a Medical name for this Sunday night only sleeping disorder, it could be the beginning of finding a solution. Thank you in advance. Going to work on Mondays is not the reason. She doesn't drink on Sundays Doesn't take naps on Sundays Lab work has been done to see if there are medical disorders No Depression, possible anxiety due to this condition by now. Nothing occurred on Sunday that's locked in her mind that we have determined. The list goes on. This is a lot to ask, but the multiple doctors consulted just could not give a reason. All of her other nights are normal sleep nightswithout fell. She is very active on weekends and her sleep schedule is close to the same as other nights.