Is it okay to leave these on overnight?
No – The recommended usage is 20 minutes, which is just the right amount of time to achieve results. If you would like to experiment with leaving them on a bit longer, we suggest slowing ramping up the usage time, since everyone tolerates products differently. Gradually increase the wear time (approximately 5-minute increments) until you reach your desired wear time. We would not recommend exceeding 2 hours.