Why can’t you sleep on planes?

What makes sleeping on a plane so much harder than on land? For most travellers, a lack of privacy and personal space; dry, recycled air; turbulence and noise are a few factors that make it really hard to fall sleep. But Zeitzer says two big barriers to sleep are actually within our control: stress and anxiety. 18-Jan-2018

https://www.bbc.com/worklife/article/20180118-secrets-of-getting-good-sleep-on-a-plane#:~:text=What%20makes%20sleeping%20on%20a,our%20control%3A%20stress%20and%20anxiety.