Find your daily energy peaks
Energy isn’t flat across a day, and it isn’t random. For most people it follows a broadly predictable circadian arc: alertness climbs to a late-morning peak, sags in the early afternoon, lifts again, then winds down toward night. Knowing the shape of your own curve lets you put hard work where the energy is.
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The shape of a normal day
A typical waking day has a recognisable rhythm. Alertness rises through the first few hours and tends to crest in the late morning, then slips into an early-afternoon trough — the post-lunch dip — before recovering into a second, usually smaller, late-afternoon peak. After that, energy gradually winds down as the body prepares for sleep. The exact heights and timings vary, but the broad pattern is common enough to plan around.
Why the afternoon slump is real
The early-afternoon dip isn’t only about lunch. It’s partly driven by your circadian clock, which produces a natural lull in alertness in the post-midday window, layered on top of the sleep pressure that has been building since you woke. A heavy meal can deepen it, but the trough tends to show up even on light-lunch and skipped-lunch days, which is the giveaway that it’s wired in rather than purely digestive.
Match the task to the moment
The practical move is to align demand with supply. Reserve your peaks — usually late morning, and again in the late afternoon — for the work that needs focus, judgement or creativity. Park the low-stakes admin, email triage, routine errands and easy meetings in the post-lunch dip, when precision matters less. Fighting the trough with a hard task is often slower than simply scheduling around it.
Protect the wind-down, and know your chronotype
The evening decline is a feature, not a bug: it’s your body lining up for sleep, so guard it rather than overriding it with bright screens or late stimulation. And remember the whole curve shifts with chronotype — a later type’s morning peak may not arrive until well after a morning lark’s has passed, so the right schedule is the one anchored to your timing, not the clock on the wall.
Vitra’s energy timeline on the Overview plots a forward-looking, hour-by-hour predicted alertness curve anchored to your actual wake time — naming your morning peak, your post-lunch dip and your afternoon peak — all computed locally from your Oura data, so you can plan the day around the energy you’re likely to have.
Frequently asked questions
- Hilditch & McHill (2019), Nature and Science of Sleep: sleep inertia is worst immediately on waking and takes roughly 10 to 30 minutes to clear, and is far larger when you wake during the biological night
- Khalsa et al. (2003), Journal of Physiology: the human phase response curve to bright light — light before your temperature minimum delays the clock, light after it advances the clock
Pedro Thomaz builds Vitra, a desktop app that reads Oura data against your own baseline instead of a population average. He has worn a ring daily for years and reads these same numbers every morning — which is where most of what is written here comes from. Vitra is not a medical device and nothing on this blog is medical advice.
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