In order to make sure you're maximizing your Deep sleep, keep an eye on these things:
In addition, some people on our forum have discussed some of the things that have helped them get more Deep sleep. Examples include:
As a side note, if you're tracking you sleep with Zeo, an old headband could be misreading the amount of Deep sleep you get. Replacing the headband every three months or so will make sure that an aging headband, which may be less sensitive to Deep sleep, won't be giving poor readings.
Lastly, it's important to remember that our time in Deep Sleep naturally decreases as we age, and that getting too little Deep sleep may only be cause for concern if you feel tired during the day.