RE: Blowdry or sleep with hair wet?
Never sleep with wet hair. You can end up breaking it or having it very tangled in the morning.
Get your self an ion hair dryer, hair dryers don’t cause that much damage, the heat isn’t being directly applied to the cuticle of the hair. Flat irons and other heat styling tools cause more damage then hair dryers do.
Blow dry it before you go to bed, brush it out in the morning.
Or maybe it’s time for a more manageable hair cut.