1. Department of Information Physics and Computing, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo 113-0033, Japan
2. Department of Systems Pharmacology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
3. Laboratory for Synthetic Biology, RIKEN Center for Biosystems Dynamics Research, Osaka 565-5241, Japan
4. Sleep Center, Toranomon Hospital, Tokyo 105-8470, Japan