Usually stress or a change in activity rate it can also be caused by puberty
Sleep patterns: What does it mean when you sleep flat on your back with your arms under your head?
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Somnology is the study of sleep patterns.
yes
yes
I think you mean melatonin. It is used (amongst other things) to regulate sleep patterns for shift workers, people with jet lag etc.
You can still get your period while being pregnant, and you can have bleedings which are not from period! Unusual period patterns can also be caused by stress or extreme situations. Migrane can be caused by hormonal changes, like during pregnancy OR during period. Better go and see your doctor to find the cause for your unusual period patterns!
The Adrenal
Are its sleeping patterns different? Does it randomly sleep throughout the day? If it is sleeping at unusual times, this can often mean brumation. Do you see it constantly wanting to burrow? If it keeps trying to burrow, then it might want to go into brumation.
The use of drugs, alcohol,and caffeine frequently produces disturbances in sleep patterns. Alcohol abuse. cocaine.Opioids.antihistamines.corticosteroids.asthma medicines.drugs that affect the central nervous system. can affect sleep patterns.
Nothing. Dreams do not "mean" anything. They are random neuron firings at at time of the sleep cycle that happen to allow individuals to remember the patterns of neurons that fired just then.