It's an easy task!
First, exercise, yoga and meditation should be performed in the morning.
As a workout leads to tiredness automatically, it lets a person fall asleep too. Having a proper diet without anxiety may sustain it in a better way.
The schedule of sleeping hours should be set. Moreover, the usage of caffeine should be strictly prohibited as it won't let a person to fall asleep.
A light nutritious diet and walk after dinner may be worth it.
Electronic gadgets should be kept away one hour before falling asleep.
Finally, the mattress and cushion should be comfortable. In fact, they play an important role/function too.