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This definition is complemented by a definition of ‘night worker’ which sets out the following criteria: (a) where workers work at least 3 hours of their daily working time during night time or (b) where they are likely to work a certain proportion of their annual working time during night time.
Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.