Problems arising from lack of sleep

By lack of sleep, I mean < 8 hours.

Body

• Heart disease
• Cancer
• Diabetes
• weight gain
• immune system
• infection
• recovery
• shortened life span
• everything else imaginable, basically

Mind

Going short of sleep is like forgetting to save a document you've worked on all day.
—Caroline Webb (How to have a good day)

• Poor memory
• Poor creativity
• Lowered alertness
• Alzheimer's
• Many other neurological conditions
• Everything else imaginable, basically

Source

As seen in the book "Why We Sleep" by Matthew Walker. (I can't recommend this book highly enough)