Sometimes the best way to find behavior patterns is to plot them out on a graph. Yawnlog helps identify your sleep problems by displaying your snooze data in chart-form.

To get started with the web-based sleep tracking service, sign up for a free account. You can start entering sleep data right away, including backdating entries to include info from nights past. Record the approximate time you fell asleep, the time you woke up, and the quality of your sleep each night; Yawnlog will do the rest. You can even add notes to each entry if you want to keep track of variables like how medication you’re taking might be affecting your slumber.

Yawnlog gives you an overview of your daily and average sleep debt (if any), as well as an average of how much you sleep per night and how close you are to meeting your nightly sleep goals. To see how your numbers compare, Yawnlog lets you connect with other users so you can see how much sleep time you get compared to your friends. You can make your profile and data public so others can find you, or mark it private so it’s accessible only to you.

Yawnlog isn’t as robust as some of the other sleep tracking apps we’ve mentioned, but it’s a great way to get some insight into what affects your sleep and what kinds of overall slumber habits you’re developing.