Nature, nurture and the things being remembered

11. Sleep Deprivation
People who stay up late tend to get less overall sleep than those who are 
early-to-bed, early-to-rise.
"If you can't fall asleep until 2 or 3 in the morning and you have to be at 
work at 9, you're not going to be able to get as much good-quality sleep as 
you really should," Andrew Varga, MD, associate professor of medicine, 
pulmonary, critical care, and sleep medicine at Icahn School of Medicine 
and Mount Sinai Health System, told Health.
Late chronotypes with weekday jobs tend to make up for some of that lost 
sleep on the weekends, when they can sleep in. This type of "sleep debt" 
isn't that easy to catch up on, but shifting your sleep schedule on the 
weekends could still come with health risks of its own.
12. Weight Gain
Getting less than the ideal amount of sleep is a double whammy when it 
comes to weight management.
Chances are, if you're staying up late, you're also snacking late into the 
night, especially on foods high in fat and carbohydrates. These energy-
dense foods can add up to a lot of extra calories
—and quickly.

---

@articles_in_english
 
In addition, you may be hungrier when you're not getting the sleep you 
need. Getting less than enough sleep reduces your leptin levels
—the 
hormone that makes you feel full
—and, at the same time, increases your 
ghrelin levels
—the hormone that makes you hungry.
Frequently overeating at night can be bad for your health. Try making a few 
simple changes to curb late-night snacking, like keeping portion sizes down 
and getting to bed earlier. 
Possible Benefits
There are some upsides to being a naturally late sleeper. Late chronotypes 
tend to have bigger social networks. Research from Aalto University in 2015 
analyzed anonymous mobile phone data to conclude that people who stay 
up late tend to have wider social networks than morning persons and are 
also more central in their own networks.
Dr. Varga also pointed out that plenty of late chronotypes lead healthy lives 
and that more research is needed to determine the real-life consequences 
of staying up late.
"The true data on this is not very strong, and a lot of it is extrapolated from 
people in extreme situations, like shift workers," said Dr. Varga. "It's still not 
clear how serious the risks are for people whose patterns may be just a few 
hours off, so I think some caution is warranted when you're interpreting 
these studies."