- Sleep inertia
Sleep inertia is the period of impaired alertness and performance immediately after waking. It typically lasts…
- Habituation
Habituation is the process by which the brain learns to stop responding to a repeated stimulus that carries no…
- Sleep cycle
A sleep cycle is one complete pass through the stages of sleep, from light sleep into deep sleep and then into…
- REM sleep
REM sleep is the stage of sleep characterised by rapid eye movement, heightened brain activity resembling wake…
- Circadian rhythm
The circadian rhythm is the roughly twenty-four-hour internal cycle that governs sleep timing, alertness, body…
- Chronotype
Chronotype is an individual’s natural preference for when to sleep and be active. It is largely genetic, shift…
- Sleep debt
Sleep debt is the cumulative difference between the sleep you need and the sleep you actually get. It builds a…
- Social jetlag
Social jetlag is the mismatch between your body clock and your social schedule, measured as the difference bet…
- Dysania
Dysania describes extreme difficulty getting out of bed in the morning, beyond ordinary reluctance. It is not …
- Sleep drunkenness
Sleep drunkenness, clinically called confusional arousal, is a state of confusion and disorientation on waking…
- Snooze
Snooze is an alarm function that silences the alarm temporarily and repeats it after a short interval, most co…
- Mission alarm clock
A mission alarm clock is an alarm that cannot be dismissed with a single tap. It continues sounding until the …
- Alarm help articles
Why alarms fail on iPhone and Android, and how to fix each cause in order of likelihood, from ringer volume and Focus modes to the recurring silent-alarm bug.
- Waking up articles
Getting out of bed when you genuinely cannot. Sleep inertia, heavy sleeping and snooze habits, with the interventions ranked by how much evidence supports them.
- Sleep science articles
Sleep cycles, chronotypes, sleep debt and the research behind them, explained without the wellness padding and with the limits of the evidence stated plainly.
- Missions articles
How each wake-up mission works, who it suits and who it fails, what the evidence says, and how to set the difficulty so you keep using it past week two.
- Comparisons articles
Honest comparisons of alarm apps, hardware alarms and bed-shakers, including the cases where a competitor is the better answer and where an app cannot help.
- Sleep glossary
Plain definitions of the sleep terms worth knowing.
- Blog
Guides on waking up, sleep and alarms.
- FAQ
Everything people ask before installing a mission alarm.
- Sitemap
Every page on this site.
