Relax Melodies’ gorgeous sounds – from rain on the roof to a distant train – will soothe even the most wound-up listeners. The audio also includes subtle, brain-stimulating tones and beats. You can expand your options to include other sounds like brown and pink noise (think white noise, but at different frequencies) with Pro.

Fall asleep to ambient “lullabies,” and Sleep as Android will track your slumber (daily with Premium; every second day for free), including when you’re in a state of deep sleep, light sleep, or REM. It’ll even record your sleep sounds and help you stop snoring. Snooze lovers can opt for “wake-up verification,” an exercise to complete to stop the alarm.

Settle into sleep, a nap, or even deep focus (a Pro feature) with dreamscapes – audio that combines elements of hypnosis, deep relaxation, and more. While you can enjoy “Classic Sleep” for free, you’ll need Pro to hear other dreamscapes (like “Snowfall” or “Waterland”) or choose a female voiceover.

While meditation is known to quiet the mind and aid relaxation, Calm brings extra attention to the pursuit of sleep. You’ll find a section of “Sleep” meditations, including a seven-day series on “tools for a sound sleep.” While you can start for free, you’ll need to pay to access most sessions and stories.

With ambient sounds of various frequencies (pink noise, brown noise, and more) plus environmental audio like “Mom’s heartbeat,” you’re bound to find something in here to help your child snooze. If the sound library isn’t enough, you can expand it by downloading the “Market” companion app.