For damaged, overworked or colour-treated hair that needs strengthening and softness without adding time to the shower routine: hair that breaks easily, shows split ends or looks dull from regular heat styling and chemical services.

It goes on damp or dry hair and stays in overnight. Joico says to keep it off the root area, so fine or easily weighed-down hair does best with a light application. A retail product for home use.

Most repair treatments take shower time: a mask that sits for several minutes and then rinses out. Sleepover moves that work to the hours you are asleep. Applied at bedtime and left in, it uses Joico's SmartRelease liposomes to keep delivering rosehip oil, arginine and keratin through the night, with moringa seed oil for shine. The result is softer, smoother hair with fewer visible split ends in the morning, and it slots into the rest of the Defy Damage routine to help colour last longer.

• At bedtime, apply a few pumps evenly to dry or towel-dried hair.
• Avoid the root area.
• Leave it in overnight; no rinsing is needed.
• Use 2 to 3 times a week, or as needed.

• Pro: works while you sleep and needs no rinsing, so it adds nothing to the morning routine.
• Pro: one step targets bond strength, split-end appearance, colour fade and shine.
• Pro: can go on dry or towel-dried hair.
• Pro: pump bottle makes it easy to use just a few pumps.
• Con: designed to stay in overnight, so it is not a quick treatment to use right before styling.
• Con: it has to stay off the roots; too much on fine or oily hair can leave it looking weighed down.