Do you give your sims a different hairstyle for bedtime?

Yes - females only. Heck I give them different hairstyles for each change of clothes!

I picked yes because I do sometimes - it depends on what their everyday style is.

I like to try and do "believable" hairstyles that would make sense.
If my sim normally wears his/her hair in an updo, I'll try to find a hairstyle that would "match" it while down.
Vice versa for hair that is normally down. I'll try to find one that is similar (bangs, hair partings, supposed length) for an updo style for formal/athletic wear.

It really depends on the sim and the style of hair. So it is more like some sims have various different hairstyles.

i've never changed hairstyles for bedtime but i used to for formal outfits and party outfits. now i just keep their hair the same for all outfits. less hassle

I do every now and then. It depends on the sim, I guess.

If they have long hair in a ponytail or the like I change their hairstyle for bedtime. If their hair is short or medium length I do nothing (unless they wear a hat).

I usually do that.

I try to if I remember to. What I need to know is why Maxis constantly wants to send my Sims to bed in glasses in CAS when I haven't used glasses for any other of the outfits!

Not all my sims depending on their hair length, hair type and personality, but I commonly give them different styles. Most of my black female sims for example will usually have some sort of head wrap to wear for bed.