Whenever I talk to someone who is making a big career change such as going back to work after staying home with kids, or leaving the corporate world to become an entrepreneur, one of the key stressors is the loss of routine. Habit disruption adds to the stress of an already stressful time.
It can be tempting to use sleeping pills in such circumstances. But they can be habit-forming. And you may develop a tolerance to the pills so that you need a higher dose to have the same effect. Prolonged use can cloud your thinking and dampen your mood.