Give your hair a brush before bed to remove any knots and tangles. I tend to use a Tangle Teezer for this. You don't have to do the 100 brushstrokes before bedtime, but brushing before bed can help remove hairspray, or product you may have applied through the day and avoid a nasty bedhead look.
Without wanting to be too much of a princess about it, sleeping on a silk or satin pillowcase can help avoid catching hair on rougher cases, causing breakage and damage. Cotton cases can also absorb your hairs moisture, so definitely worth investing in some new pillowcases to rest your head on.
And of course, pamper it. Leaving a conditioning mask on overnight can really help nourish and recover damaged and dry hair. With the current blustery UK weather, and heating playing havoc with skin, don't forget your hair will need a little extra. Especially if you regularly colour or heat style.