Unless your room is temperature controlled, typically most houses naturally drop down in temperature at night. The drop in ambient temperature will influence the temp of a UTH if it is by itself (which it shouldn't be) or if it is controlled via dimmer, creating a natural night time drop.
Night time drops are not necessary for most species, unless you intend on cycling your animals for breeding. I keep my heat tape set to 90 degrees day and night.
Originally posted by stormyva
(95° will roast your snake!) .
She didn't list what species she was heating. If it is a cal king, then yes she's going to roast it, however if it is a ball python, a 95 degree hot spot is fine.