(1) nightmares, night terrors, teeth grinding, nocturnal sleep related eating disorders......(2) laughter and fear.....(3) Darkness is essential to sleep, the absence of light sends a critical signal to the body that it’s time to rest. Light exposure at the wrong time alters the body internal “sleep clock”
What I do before a big exam is study, get goods amount of sleep, stretch your body, practice any breathing Technics, etc. You shouldn't be stressed out from a test, just study and do things to release the stress and ace that test!
That's not true the effects last for a lifetime
During compromise you only relax some of your requirements and the other person does the same