A good night’s sleep is hard to come by these days, whether it’s because of work, tending to kids, insomnia, or sleep-related conditions like sleep apnea.

The good news: Plenty of mobile apps can help bring you a more restful night of sleep.

While many apps that monitor your sleep require a tracking device that can cost anywhere from $50 to a whopping $400, there are still quite a few options that don't require a tracker at all, and instead use the sensors built into your phone. If you're looking for a cheap and convenient way to check your sleep habits, try these apps.