Waking up abruptly during deep sleep can leave you groggy and disoriented, but the alarm itself is not harmful.

The grogginess right after waking up: "Sleep Inertia"In the morning, even though I turn off the alarm and get up, my head feels foggy for a while. My hands stop repeatedly while I'm getting dressed, ...

Interrupted sleep can influence concentration, memory, decision-making, and the ability to complete everyday tasks. Although total sleep duration is frequently discussed as an indicator of adequate ...

Shift work disrupts the alignment between the biological clock and work hours, leading to impaired alertness, slowed reaction times and reduced decision-making capacity upon awakening or during night ...

Researchers led by Masako Tamaki at the RIKEN Center for Brain Science in Japan report a link between deep sleep and cerebrospinal fluid, the clear liquid that surrounds and supports the brain and ...

Sleep inertia is a common symptom of idiopathic hypersomnia (IH). With sleep inertia, you feel very groggy and out of sorts when you wake up. It usually happens after you’ve been asleep for at least ...

Scientists now know that while we snooze, our brains help solidify the memories we made during the day. In this Special Feature, we investigate whether simple techniques might help improve memory ...

In a reward-free touchscreen game, Japanese macaques favored a button that made a puppet pop up in somewhat unpredictable spots, like curious humans. Menopause before 40 was tied to a 30% higher risk ...

Share on Pinterest Research offers new clues about the ways in which sleep aids daily memory function. Image credit: THAIS RAMOS VARELA/Stocksy. One of the main functions of the human brain is to ...

Highly superior autobiographical memory, or HSAM, is a remarkable ability that allows people to perfectly recollect every day of their life. In a new study, researchers conducted a polysomnography ...

Using a melodic song you enjoy as an alarm sound can potentially reduce feelings of grogginess upon waking. However, waking suddenly from sleep may have negative effects. Many people use an alarm ...