Lesser Known Ways to Increase Deep-Sleep?

[loub]

A few months ago I bought a sports watch to track my running progress. The watch also tracks sleep and time spent in different sleep-cycles and made me aware that I have consistently been  getting only 0-10min of deep sleep every night.

Since then I have been looking into ways to increase deep sleep and I now sleep in complete darkness with a sleep-mask on, tape my mouth, reduce exposure to light and stop eating ~2h prior to sleep. So far not much has changed.

Does anyone here have experience with increasing deep-sleep? Any insights and tips would be appreciated.