1.How much sleep do you usually get?
2.Do you manage to sleep as much as you need? If not, why not?
3.Have you ever suffered from insomnia?
4.What do you do when you have trouble sleeping? Do you use any special tips that help you get to sleep?
5.Do you have a nap at lunchtime or at another time of the day? Does it help?
6.Have you ever slept in a strange place that was not a bed?