I have no idea what is going on.

I live in a tri level home. I have a basement, a main level and an upstairs.

* Sometime during the day while everyone is at work/school the power in the basement guest bedroom goes out. all 4 outlets and the light switch. and the utility closet light switch goes out but not the outlets. The utility closet is also in the basement.
* the main floor, nothing goes out. everything works.
* the upstairs has 3 bedrooms and 1 bathroom. 1 bedroom goes out except for 1 outlet.
* there are 4 outlets and a light switch. 3 go out and the switch goes out.
* the other 2 bedrooms are fine.
* also the hallway light is fine.
* the bathroom has 2 lights with 2 light switches and 1 fan with a switch and 1 outlet. I lose power to 1 switch. everything else is ok.
* then.....sometime in the middle of the night, I gain power to the upstairs only. the basement stays without power.

This happened a couple of weeks ago and I flipped the main breaker on and off and everything went back to normal.

for about a week, everything was fine. until about 3 days ago. for the last 3 days it's been the same everyday. lose power during the day and comes back (for upstairs only) during the middle of the night.

btw, no breakers are tripping and I have taken off every single cover to every single room that loses power and nothing is loose or anything.

Any help would be appreciated.

I will call power company in the morning.