Effects of different light incident angles via a head-mounted device on the magnitude of nocturnal melatonin suppression in healthy young subjects.

"Declarations Conflict of interestThe present study was conducted in collaboration between the Densei Communication Inc. and Hokkaido University with the sponsorship and supply of the head-mounted bright light device used in the present study from the DENSEI COMTEC Inc. There are no conflicts of interest associated with this publication. Ethical committee permissionThis study was approved by the ethics committee of the Hokkaido University Graduate School of Education (no.17–47) and was conducted according to the Declaration of Helsinki. Informed consentAll subjects provided their written informed consent. Conflict of interest The present study was conducted in collaboration between the Densei Communication Inc. and Hokkaido University with the sponsorship and supply of the head-mounted bright light device used in the present study from the DENSEI COMTEC Inc. There are no conflicts of interest associated with this publication."

"The present study was financially supported by the Grant in Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) (No. 16K01723 to YY, No. 19H03993 to YY) and scholarship donation from the DENSEI COMTEC Inc. to YY. The authors are grateful for the valuable contributions from all study participants. The authors would like to thank Dr. Noriko Matsuura, Mr. Hijiri Tamura, Mr. Koki Kitamura, and Mr. Ren Sato for technical assistance. Declarations: Conflict of interestThe present study was conducted in collaboration between the Densei Communication Inc. and Hokkaido University with the sponsorship and supply of the head-mounted bright light device used in the present study from the DENSEI COMTEC Inc. There are no conflicts of interest associated with this publication.: Ethical committee permissionThis study was approved by the ethics committee of the Hokkaido University Graduate School of Education (no.17–47) and was conducted according to the Declaration of Helsinki.: Informed consentAll subjects provided their written informed consent. Conflict of interest: The present study was conducted in collaboration between the Densei Communication Inc. and Hokkaido University with the sponsorship and supply of the head-mounted bright light device used in the present study from the DENSEI COMTEC Inc. There are no conflicts of interest associated with this publication."