I found a great app for meditation called one giant mind.

Its so difficult to switch off nowadays since mobile phones became glued to your hands and your eyeballs to the screens. Easier said than done by try not to do use your mobile atleast 2 hrs before bed. Or i find making yourself yawn helps to secrete melatonin which makes you drift of best not to try and not to think too much otherwise it can send you the other way breezing excercises with long deep breaths works well too.