I can't sleep because my ear itches! could this be related to stress?

Unlikley: You can try some mineral oil in the ear before you sleep (assuming there is no hole in the ear drum). There is also a nice prescription medication for itchy ears called dermotic oil.. Your primary care could prescribe or your local ent.

Sleep: Stress could cause itching as a symptom, ear itching seems specific, rule out a bite sting etc before assuming its psychological.