An independent publication that tests sleep advice against the research. Evidence-rated guides to circadian rhythm, the bedroom environment, supplements and sleep technology.https://sleepmaxx.org/en-gbhttps://sleepmaxx.org/circadian/circadian-rhythm/https://sleepmaxx.org/circadian/circadian-rhythm/How the circadian clock and sleep pressure decide when you sleep, how light resets the clock, and which habits the research supports. Evidence-rated.Tue, 03 Nov 2026 00:00:00 GMThttps://sleepmaxx.org/circadian/morning-light/https://sleepmaxx.org/circadian/morning-light/What morning light does to your body clock, how bright it needs to be, and which popular rules (like '10 minutes within 30 minutes of waking') are actually tested.Tue, 03 Nov 2026 00:00:00 GMThttps://sleepmaxx.org/circadian/caffeine-and-sleep/https://sleepmaxx.org/circadian/caffeine-and-sleep/How long caffeine lasts, what it does to sleep, and evidence-based cut-off times by dose, from a 2023 meta-analysis and a 2025 randomised trial.Tue, 03 Nov 2026 00:00:00 GMThttps://sleepmaxx.org/environment/bedroom-temperature/https://sleepmaxx.org/environment/bedroom-temperature/Is 18°C really the ideal bedroom temperature? What sleep studies show about heat, cold, humidity, warm baths and bed socks, with evidence ratings.Tue, 03 Nov 2026 00:00:00 GMThttps://sleepmaxx.org/compounds/l-theanine-sleep/https://sleepmaxx.org/compounds/l-theanine-sleep/Does L-theanine improve sleep? What two recent systematic reviews found, and an honest comparison of capsules and pouches like Alyva for bedtime and evening.Tue, 03 Nov 2026 00:00:00 GMT