take a look at gigalixir.com. I'm moving an app over there right now and they don't do the annoying sleep thing, or the daily restarts. You also get a free 10k row db. Pricing is reasonable if/when you want to scale later too. More expensive than rolling it on GCE yourself, but you get all the convenience of the heroku workflow.
I will check them out. Thank you.
Founder of Gigalixir here in case you have any questions. Also happy to give out free credits for the standard tier. Gigalixir also works with many languages other than Elixir.