Dyno idling is documented, and it only happens to web dynos, when there is only one running. https://devcenter.heroku.com/articles/dynos#dyno-sleeping https://d

Dyno idling is documented, and it only happens to web dynos, when there is only one running. https://devcenter.heroku.com/articles/dynos#dyno-sleeping https://devcenter.heroku.com/articles/dynos#dyno-sleeping I can say from experience they definitely do not scale down the dynos you are paying for - you still see log entries from them and they are immediately available to requests.