Absolutely Your body uses sleep as a rebuilding time for muscles. Your muscles use energy most efficiently. If they never have time to recover then they cannot work properly. Therefore your energy can be depleted. However, lack of energy can be a sign of more serious issues such as anemia or thyroid problems. If this is an on going problem you should definitely consult your physician.
Lack of sleep does cause your immune system to be weaker so yes.
it's much more likely that the lack of sleep itself is not the cause of the suicidal thoughts, but is another symptom of depression. But, yes, lack of sleep can cause one to feel meh, and possibly simulate depression.
Lack of sleep can be the cause of many things including ulcers. They have been known to cause both gastric ulcers and mouth ulcers.
A lack of sleep makes it more likely to have a heart attack or stroke, but is not known to actually cause one.
stress,depression,lack of food, lack of water, smoking, drinking,
It can. It depends on everyone's individual bodies, but lack of sleep can weaken the immune system, causing a person to be more suceptable (spelling?) to illnesses. Also a person's energy level will most likely be affected
lack of sleep
Yes
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Lack of sleep because of stress in ones life could be a cause of grey hair. Anything stress related can cause gray hair.
I am assuming you mean "how does a lack of sleep effect your eyes?" Low levels of sleep will cause redness in the whites of the eyes and will cause you to get dark circles under the eyes.
Because it boosts your alertness and energy level.