My favorite is Kerastase Nutritiv 8hr Magic Night Serum.. I apply to dry hair and then throw my hair in a loose braid before going to bed. I have fine hair with a slight wave and when I use it I wake up and my hair feels super smooth and healthy. If you have curly or coily hair it might not be strong enough for an overnight treatment though. And, unfortunately Ulta doesn’t carry. I have to get at my salon 😢