Table 1.

The top 10 countries and top 5 institutions with most publications in the field of insomnia and circadian rhythm.

Rank	Country	N (%)	Institution	N (%)
1	USA	1,672 (21.00)	University of California	269 (3.38)
2	England	396 (4.97)	UDICE-French Research Universities	226 (2.84)
3	China	341 (4.28)	Harvard University	206 (2.59)
4	France	319 (4.01)	Institut National de la Sante et de la Recherche Medicale (Inserm)	180 (2.26)
5	Italy	318 (3.99)	Harvard Medical School	152 (2.59)
6	Germany	300 (3.77)
7	Japan	291 (3.65)
8	Canada	288 (3.62)
9	Australia	275 (3.45)
10	The Netherlands	205 (2.57)