Q: Lately it’s been taking me 11 hours in bed to get 8 hours of sleep, as measured by my smartwatch. I’m concerned about spending that much time in bed. What can I do to improve this?
A: If you allow 11 hours in bed but only need 8 hours sleep, you can expect to be doing something else besides sleep — like tossing and turning in frustration — for 3 of those hours.
To reduce the misery and aggravation at your inability to sleep, the key is to improve your sleep efficiency. In practical terms, this means to make the best use of time in bed for actual sleep. There are many ways to accomplish this.
First, some context to better understand your situation. There is nothing magic about “8 hours”. The normal adult range is 7 to 9 hours. Your ideal number is based on a number of individual conditions, including your age, health, exercise level, waking activity, stress you experience on any given day, diet, and many other particulars.
Second, your watch cannot accurately measure sleep. No wearable lacking a legitimate EEG feature can. Most wearables are good at best for only a rough estimate. But beware: when these devices start causing more stress about sleep, they’ve defeated their purpose. Use of a written sleep log that you complete first thing in the morning is an alternative, and possibly more accurate.
Getting back to sleep efficiency. Literally no one has 100%. The best of us are at around 90%, meaning at least 10% of time in bed is spent awake. For 8 hours in bed, that means at least 45 minutes doing something else besides actual sleep — and that’s true for even the best sleepers. Normal sleepers average around 80% or more sleep efficiency.
One of the keys to improving sleep efficiency is using a consistent wake time. That’s what sets your body clock and synchronizes to your homeostatic sleep drive. By doing that you can then methodically adjust bedtime until you find the best balance between sleep efficiency and how you feel and perform the following day.
Typically with insomnia, other issues such as stress overlap with wake time to undermine sleep. The best overall solution is to use a CBT sleep training system, which gives you a comprehensive substance-free structure to permanently resolve insomnia.