I notice it very quickly, but by week 2 you'll know it.
By week 3 night sweats....get a favorite towel next to your bed. Actually 2, one to dry off with the other to cover up the full body print wet spot of sweat you'll be leaving on the fitted sheet.
Question: Why do we sweat like that only at night....its not like i go to work and have to ring out my shirt, underwear and jeans at lunch? Just wondering.