Get some Headspace

Good for:  De-stressing and calming down, general well-being
Not so good for:  Staying awake when you are tired

You can get an app for meditation, it's called Headspace.  I tried it, and so did a journalist:  http://www.huffingtonpost.co.uk/2013/07/09/headspace-meditation-benefits_n_3567421.html

I found it ok and possibly even invigorating, except I kept falling asleep whilst doing it.  :P  I have been told you need to practice focus in order to focus. Hmmmm. Try it, and if you do, please share you experience with me.  :)