I used a time tracker (Yast, but there are many) to keep myself honest and find a schedule that worked for me. If you prefer a 9-5, set alarms and schedule morning activities. But if you work better at a 16 hour stretch with the next day as a break, that is okay! Be patient with yourself and thankful you have such flexibility. Communicate regularly with coworkers and clients; this may help you find a more regular schedule. Remind yourself every day who is depending on you. The most important person depending on you is yourself, so make your own health and happiness a priority.