Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Clocks & Sleep was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 21 days and the median time to publication was 49 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abhishek Chatterjee | Irene Torres-Sánchez |
| Adela Badau | James Olcese |
| Adriano Barra | Jos H.T. Rohling |
| Alvaro Lopez-Samanes | Juan Pedro Martínez |
| Andrew N. Coogan | Kai Spiegelhalder |
| Angelina Maric | Katarzyna Burek |
| Anjolii Diaz | Keith Pecor |
| Anna Brzecka | Kelly Bulkeley |
| Anton Kutikhin | Konstantinos Kompotis |
| Arcady Putilov | Lauren Douma |
| Arlener D. Turner | Lorenzo Tonetti |
| Atul Kumar Pandey | María Del Carmen Pérez-Fuentes |
| Axel Steiger | María M. Morales Suárez-Varela |
| Beata Greb-Markiewicz | Martina Pavlíková |
| Bernard Possidente | Masaru Tanaka |
| Bharath Ananthasubramaniam | Massimo Bracci |
| Chanpreet Singh | Michael Schredl |
| Christina Schmidt | Mikhail F. Borisenkov |
| Concettina Fenga | Mirja Tenhunen |
| Daniel Erlacher | M.S. Zobaer |
| Dhananjay Yadav | Neeraj Soni |
| Dylan Selterman | Patricia L. Lakin-Thomas |
| Fabio Fabbian | Pedro Gil-Madrona |
| Francesca Conte | Qian Xiao |
| Gaetano Riemma | Roberto Frau |
| Gina Maria Caetano | Roger Ho |
| Giulio Bernardi | Serge Brand |
| Giuseppe Grosso | Soraya L. Valles |
| Giuseppe Santarpino | Yuki Matsumoto |
| Halszka Oginska | Zurab K. Silagadze |
| Helena Martynowicz |
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