REM - Your Brain’s Magical Cleanse!
Every night, while you are fast asleep, your brain quietly gets to work — replaying the day, sorting memories, processing emotions, and generating the mental clarity you will need tomorrow. This happens largely during REM sleep: a remarkable stage that accounts for roughly a quarter of your night. You cannot force more of it into existence, but you can easily sabotage it — and many of us do, without realising. Here is what REM sleep is, why it matters, and what you can do to protect it.
REM Sleep: architecture, function, and optimisation
REM sleep is a physiologically distinct state characterised by desynchronised, wake-like cortical activity, rapid conjugate eye movements, and near-complete skeletal muscle atonia — the last of which is actively generated by brainstem circuits and serves to prevent the physical enactment of dreams. In healthy adults, REM comprises approximately 20–25% of total sleep time, equivalent to roughly 90–120 minutes per night on a full seven-to-nine-hour sleep episode. REM is heavily concentrated in the final third of the sleep period, with successive episodes lengthening across the night — meaning that even modest curtailment of total sleep time disproportionately reduces REM. The functional roles of REM are well evidenced, though its contributions often work in concert with non-REM sleep rather than in isolation. REM is particularly implicated in the consolidation of procedural, associative, and emotionally significant memories, and in the processing and regulation of emotional experience. The contribution of REM to creativity reflects its capacity to form novel associative links between memories during a period of markedly reduced noradrenergic activity. Alcohol consumed before sleep suppresses REM in a dose-dependent fashion, confirmed by systematic review and meta-analysis. Late caffeine intake delays REM onset and reduces total REM duration. Sleep apnea, in its REM-predominant form, fragments and reduces REM with documented downstream effects on neurocognitive and cardiometabolic outcomes. The most reliable levers for protecting REM are also the foundations of good sleep hygiene: adequate and consistent total sleep duration, a stable schedule, a cool and dark sleep environment, and mindful management of alcohol and caffeine.
Good morning! Rise and shine!
The first hour of your day is quietly powerful. A few simple habits — a bit of daylight, a glass of water, a little movement, and a pause before you pick up your phone — can shift how alert, calm, and focused you feel for the rest of the day. A good morning routine is not the longest or most impressive one. It is the short, sensible one you can actually repeat most days. Start with one or two small things, keep them consistent, and build from there.
Rise & Shine: The Science of Morning Routines
This Deep Dive examines four interrelated questions that sit at the heart of morning routine research: what physiological mechanisms make the first hour after waking particularly influential; how circadian timing, light exposure, and cortisol regulation interact to affect daily functioning; what evidence supports specific morning behaviours for cognitive performance, mood, and sleep quality; and how habit formation science applies to establishing sustainable morning practices.
The evidence base draws on circadian biology research, randomised controlled trials of morning light therapy, cortisol awakening response studies, and meta-analyses of habit formation interventions. Key methodological limitations are noted where they affect the interpretation of findings.
Good morning! When is the best time to wake up?
There is no single best time to wake up that works for everyone — but there is a right approach for you. Your ideal wake-up time is one that fits your natural body clock, gives you enough sleep, and stays consistent from day to day. Getting light into your eyes soon after waking, moving your body, and anchoring your mornings to a steady time are the three habits that matter most. The specific hour is far less important than whether you can stick to it.