How Many Hours Should I Wear Invisalign?
Invisalign trays should be worn for about 22 hours a day, the only times that you should not be wearing your trays is when you are either eating or drinking. Though you are still allowed to drink cool water while wearing Invisalign, sugary beverages are prohibited. 22 hours a day means yes, you do need to wear it while sleeping, if you do not comply with the amount of time needed then it may impact overall treatment time.
To Learn more about Invisalign: http://diamondbraces.com/invisalign/