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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1945 1
1946 9
1947 16
1948 14
1949 17
1950 12
1951 14
1952 11
1953 18
1954 20
1955 28
1956 35
1957 33
1958 31
1959 43
1960 43
1961 64
1962 74
1963 124
1964 213
1965 242
1966 159
1967 211
1968 180
1969 227
1970 222
1971 237
1972 249
1973 275
1974 311
1975 250
1976 275
1977 297
1978 316
1979 306
1980 332
1981 331
1982 435
1983 424
1984 472
1985 406
1986 508
1987 768
1988 977
1989 1378
1990 1919
1991 1670
1992 1508
1993 1387
1994 1369
1995 1271
1996 1179
1997 1090
1998 1082
1999 977
2000 1241
2001 1390
2002 1394
2003 1317
2004 1628
2005 1854
2006 2277
2007 2530
2008 2760
2009 2785
2010 2738
2011 3092
2012 3219
2013 3346
2014 3237
2015 3416
2016 3311
2017 3203
2018 3271
2019 3208
2020 2563
2021 1744
2022 1160
2023 1027
2024 1939
2025 1538

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Page 1
Arousal systems.
Jones BE. Jones BE. Front Biosci. 2003 May 1;8:s438-51. doi: 10.2741/1074. Front Biosci. 2003. PMID: 12700104 Review.
Arousal systems.
Marrocco RT, Witte EA, Davidson MC. Marrocco RT, et al. Curr Opin Neurobiol. 1994 Apr;4(2):166-70. doi: 10.1016/0959-4388(94)90067-1. Curr Opin Neurobiol. 1994. PMID: 7913640 Review.
Noradrenergic modulation of wakefulness/arousal.
Berridge CW, Schmeichel BE, España RA. Berridge CW, et al. Sleep Med Rev. 2012 Apr;16(2):187-97. doi: 10.1016/j.smrv.2011.12.003. Epub 2012 Jan 31. Sleep Med Rev. 2012. PMID: 22296742 Free PMC article. Review.
75,591 results
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