Sleepless nights or not getting proper sleep due to stress and anxiety ?? then Pranayam n meditation is the ideal solution for it 
but if you're not acquainted with it. Then follow this method, which is derived from it 
https://cdn.pixabay.com/photo/2016/04/26/03/11/sleeping-1353562_960_720.jpg
This method **4-7-8 breathing** by dr weil  has benefitted many, it may help you too if you believe so. Bettter than nothing 
its a simple method, not only helps with sleep disorder but upsetting moods, so here it is 

Exhale completely through your mouth, making a whoosh sound.
Close your mouth and inhale quietly through your nose to a mental count of four.
Hold your breath for a count of seven.
Exhale completely through your mouth, making a whoosh sound to a count of eight.
This is one breath. Now inhale again and repeat the cycle three more times for a total of four breaths.

Note that with this breathing technique, you always inhale quietly through your nose and exhale audibly through your mouth. The tip of your tongue stays in position the whole time. Exhalation takes twice as long as inhalation. The absolute time you spend on each phase is not important; the ratio of 4:7:8 is important. If you have trouble holding your breath, speed the exercise up but keep to the ratio of 4:7:8 for the three phases. With practice you can slow it all down and get used to inhaling and exhaling more and more deeply

Here is the link of the article below, please go through it.
[Source](https://www.drweil.com/videos-features/videos/the-4-7-8-breath-health-benefits-demonstration/)