Sleep is a big contributor to a lot of things including stress levels certainly, but not limited to those that you most commonly think of.  In particular, a good amount of sleep, even including a nap in some cases, could contribute to clear skin and lesser occurences of wrinkles.  While most treat the visual and outer cases of wrinkles, you really should be treating the root causes, which most doctors and dermatologists are just not inclined to do, as they would have to recommend more natural products rather than expensive prescriptions among other things. 

In particular, you could eat a more balanced diet, avoid chocolate, exercise and really keep your body clean after exertion, drink plenty of water, etc.  These few steps would eliminate a significant number of cases, eliminating the need for many consultations among other things.  There are doctors and pharmacists in other countries who have no hesitation in telling you to avoid these basic things.  But American doctors are far less likely to.

But if you are able to sleep anywhere from 7 to 9 hours each night, you will be significantly more likely to actually obtain the results from that sleep.  these hours will allow you to be fully rested, control hormones, control extra stress, and otherwise help you to rejuvenate your body, allowing it to replenish the skin at night and ultimately avoid acne.  And while the skin opens its pores to repair itself and replenish, a night cream can be especially helpful if you choose to use these.  In short, sleep is not directly responsible for wrinkles.  However, it causes many of the contributing factors that you may or may not actually think of, and there are certainly natural products that could help to enhance this.