Starzio Vault

Sleep is easier to understand when you treat it like a balance rather than a single number each morning. This tracker takes your personal sleep-need target and measures every night against it, so a short night becomes a withdrawal and a long one becomes a deposit. What builds up over time is a running balance: either a surplus you have earned or a sleep debt you still owe.

Logging a night is a short, deliberate routine. On the vault screen you enter the time you went to bed, the time you woke, any minutes spent napping, and a restfulness rating from 1 to 5 for how the night actually felt. Then you deposit the night, and the balance meter responds immediately — filling as surplus accumulates, draining as debt deepens. It is a small daily action that turns scattered sleep into something you can read at a glance.

Because nobody needs exactly the same amount of rest, the targets are yours to set. The setup screen holds separate sleep-need figures for weeknights and weekends, which keeps a later Saturday from being judged by a Tuesday standard. You also choose the rolling window the balance is calculated across, so you can decide whether you want a tight, recent picture or a longer view that smooths over the odd rough night.

The ledger screen is where the pattern becomes visible. Every deposit is listed night by night, with trend bars that show the shape of the past stretch and averages that summarise it. Most usefully, it works out how many extra minutes per night you would need to add in order to clear the debt you have accumulated — a concrete, achievable figure instead of a vague instruction to sleep more.

That shift from guesswork to arithmetic is the point. Instead of wondering whether you are genuinely behind on rest or simply tired today, you can see the size of the gap and how long it would realistically take to close. If you have ever promised yourself an early night without knowing whether it was enough, this gives that promise a number.

The approach suits anyone whose schedule refuses to stay regular: shift patterns, early starts, late finishes, broken nights, or weeks where sleep is the first thing to be sacrificed. Keep depositing each morning, watch the balance recover, and let the ledger show you the progress rather than relying on how you happen to feel at the time.