Why does my password on my laptop change?

[iMore Question]

I have an Apple laptop, iPad, and iPhone. For some reason overtime I close my laptop and attempt to sign on the following day it says my password is incorrect. I first thought I was forgetting it, but today I took the time to change it and wrote it down! Sure enough I'm trying to sign in tonight and it says my password is incorrect!!! Please help!

 

[Just_Me_D]

Is it possible that someone else who has access to your device and your desk area has changed it to something he or she prefers?