I'm 67 and for many years I use self hypnosis to fall asleep. Also sex of any type is "natural" sleep aid.
Within our subconscious mind we retain a primitive mechanism to both remember stress, and control our ability to sleep. When we are in balance we send the appropriate instruction to our subconscious, and the sleep mechanism simply takes over. However when this balance is disturbed the result is sleeplessness. The mechanism which controls sleep is both "reactive" to our desire to sleep and "responsive" to our body's need for sleep. If we send the appropriate instructions to our subconscious mind it will begin to shut down our bodily functions and prepare us for sleep. These instructions can be triggered by the appropriate degree of physical fatigue.
Overcoming sleeplessness is dealt with by teaching and practising the following skills:
The ability to consciously relax and to release stress any time, anywhere,
The ability to focus your mind
The ability to neutralise and reprogram hurt memories
The ability to develop mind/body exercises to overcome depression
The ability to develop new responses to stressful events
You can try taking Melatonin. It is a natural sleep aid that you can find in your local vitamin aisle.