What make some empire enjoy thickset sleep while others not?

can u tell me why plentiful people can't stir up until u scream surrounded by their ears while others wake up once u move around???What make some empire enjoy thickset sleep while others not?
contained by my opinion and from my scrutiny , I think that relatives who have a sharp memory other don't sleep so deeply and you can rouse them up just if you touch them or if you formulate any sound approaching you said , just move around them , while nation who are always forgetting things usually sleep so severely , and you can't wake them up even when you are screaming unless you take them from the bed and throw them on the floor .
The older you catch, the more stress you have, unrepressed lifestyle, bad diet, and form trouble all front to a reduced ability to sleep severely. The less insightful sleep you have the smaller number your body regenerates and repairs. This lead to accelerated decrepitude. fw
It depends on the people sleep cycle and also how they are "wired". If a person grows up surrounded by a household where everything is loud consequently they are more likely to sleep through anything. This is because their brain become accustomed to the presence of noise.