Understanding sleep
Deep sleep without chasing a perfect number
By Sömnlyftet · created with AI support Updated:
The main answer
Deep sleep is one stage of sleep and usually occurs more in the earlier part of the night. You cannot choose a precise amount through willpower. A watch's estimate should be considered alongside the whole night and your own experience.
Deep does not make other stages unimportant
Deep sleep is also called stage three of non-REM sleep. The classification reflects patterns of brain activity during sleep. Lighter sleep and REM sleep also belong to a usual night. The aim is not to replace as much of those other stages as possible.
An estimate is not a complete account
Products estimate sleep in different ways. An app may help you notice habits, but a single label or percentage is not the whole picture. Read how your particular product works, and avoid comparing values from different models as though their methods were identical.
National Sleep Foundation · Consumer sleep technology (2026)
Make room for sleep rather than trying to command a stage
Focus on what you can influence: enough opportunity for sleep, workable timing and a room that does not disturb you. Assess changes over time. A higher app value alone does not prove that a particular evening habit gave you more deep sleep.
An illustrative example
You feel reasonably refreshed, but your watch shows less deep sleep than yesterday. Rather than reorganising your day around the number, you look at several nights, your sleep times and how you actually feel and function.
A common question
How many minutes of deep sleep should I aim for?
There is no single consumer-watch minute target that suits everyone. Needs and measurement methods differ. Start with overall sleep and daily functioning rather than trying to perform a particular stage.
Sources and authorship
The sources describe sleep and habits in general. They have not evaluated Sömnlyftet. The examples are fictional and illustrate an approach, not the results you will achieve.