Why do i weigh more in the morning than in the evening

I am currently consuming around 4500-5000 calories a day and drinking 3liters of water a day.

The weird thing is I feel full all the time on this diet but i weigh around 181 in the evening and in the morning I weigh 184-185 (after i relieve myself)

What in the world is going on?

Good question--Maybe the amount of liquids your taking in has something to do with it.