Sleep is the lead indicator, not the lagging one energy follows sleep by 2–3 days

For the first year I logged energy as the headline metric. How am I doing this week? Three out of five, two out of five, decent.

The problem is energy is the lagging indicator. By the time I noticed energy was down, the cause was already two or three days back. Sleep is the lead indicator.

A bad night on Monday shows up as flat energy on Wednesday or Thursday, almost reliably enough to schedule around. When I started logging sleep as the first line every week — not minutes or hours, just better-same-worse versus last week — the energy entries that came after suddenly made sense. The chain runs sleep first, then digestion or appetite a day behind, then energy two or three days behind that.

A bad night on Monday shows up as flat energy on Wednesday or Thursday, almost reliably enough to schedule around.

If you know sleep moves first, you can plan around it. A flat Monday tells you Wednesday's the day you don't book the school run swap or the gym class. The forecasting isn't medical advice — it's just pattern recognition on your own data.

The prescriber doesn't see your sleep at home. You do. Titra has a notes field, and putting sleep at the top of the weekly entry rather than buried under the side-effects list is a one-line behaviour change that pays back across months.