Does poor sleep affect skin ageing?

I think this will depend on age, quality of sleep and time-frame of the poor sleep.

There have been some studies demonstrating that poor sleep, for a protracted period, is likely to result in increased trans-epidermal water loss (TEWL). This can lead to the skin becoming more lined, less plumped and can make the surface quite uneven. Skin tends to recover from sunburn better in people who sleep well.

Interestingly, people who suffer from protracted sleep problems tend to rate their appearance as less attractive, not just their skin, when they are sleep deprived. So, if you are, you skin might not look as bad to other people as it appears to you!