Tell me if this sounds familiar: You wake up sleepy and irritable, despite going to bed early. You even stopped drinking coffee after noon so you can go to bed on time. Nothing seems to be helping.
Maybe the problem isn't your caffeine intake or your bedtime. Maybe your sleep cycle is off. If your alarm or something else wakes you up during the REM portion of your sleep cycle, it can ruin your day.
The trick, then, isn't getting to bed early, but getting to bed at the right time - and waking up at the right time.
For that you need an app like Sleep Cycle Alarm. There's a reason this app has a nearly perfect 4.5 star rating in both iTunes and the Google Play store! Just place your phone next to your pillow and it does the work for you.