The way a person feels when waking up from sleep, day or night, depends largely on the sleep stage the person was in just before waking up.
This “sleep inertia” affects how someone feels for a little while after waking.
Waking from what is called slow-wave sleep, a deep sleep without rapid eye movement, a person is very likely to feel groggy, but one is much less likely to feel groggy when emerging from rapid-eye-movement sleep or one of the lighter non-REM stages.
Other factors that may rum the morning include:
major depression, in which people feel much worse in the morning and better as the day goes on;
severe obstructive sleep apnea, or failure to breathe when sleeping, which means sleep is constantly though unconsciously interrupted by waking to resume breathing;
and the use of sleeping pills that are still working in the morning.
Even extra sleep can leave a person tired if it represents a failed effort to make up for lost sleep.
We have no way of controlling what stage we awaken from but all of the other problems are treatable disorders.
Related Posts
-
Why Do Your Eyes Feel Scratchy and Sandy When You Wake Up Tired the Next Day?
"Sand" and scratchy eyes are not cause and effect but are both the result of irritation. The so-called sand, or "sleep" that builds up at the corners of the eyes is actually dried…
-
What Causes Crusty Eyes When You Wake Up In the Morning and Where Does the Sand or Sleep Come From?
The scientific term for the yellowish crystalline substance sometimes found encrusted on eyelids when you wake up is "Rheum", or gound. It is also commonly referred to as "sand" or "sleep". Some amount…
-
Why Don’t People Wake Themselves Up When They Snore and Do People Who Snore Know They’re Snoring?
A vast majority of snorers are in fact men, and may be waking up hundreds of times a night without remembering it in the morning. Snoring in its worst form is a symptom…
-
Does a Full Bucket of Water Freeze into a Full Bucket of Ice?
No, it doesn't. Although most substances shrink when they change from a liquid to a solid, this is not true of water. When water freezes, it expands, or gets bigger, actually one-tenth bigger.…
-
Which Animal Wears a Suit of Armor?
The armadillo is a small mammal whose upper body is encased in armor. In fact, armadillo means "little armored thing" in Spanish. The armor is composed of many bony plates which overlap. These…
-
Why Do Babies Sleep So Much and How Fast Do Babies Grow When They Sleep?
One reason babies sleep so much is that human growth factor, made by the pituitary gland, is secreted during sleep in higher concentrations than when the baby is awake. How the body and…
