The Cameron 50x84 Charcoal panels I got are fantastic at blocking out the light. We decided to use it in the bedroom to help us sleep better and longer.  We installed the panels during the day, and we immediately noticed the darkness. It's great for those mornings when you can and want to sleep in late. No more waking up to unwanted natural light shining through your windows and blinds. However if you do need to wake up at a certain time, definitely set your alarm, and loudly. Otherwise, your body is going to want to keep sleeping.