In Test matches, each of the five potential days of the match typically comprises three main sessions, usually referred to as the morning, afternoon, and evening sessions.
The exact timing of these intra-session breaks is the umpiring team's call.
Additionally, day-time ODI matches include a lunch break between the first and second innings.
[2] Sessions of play often influence a team's tactics for a match, especially as natural light varies over the course of the day, and the pitch wears over the course of a match, whether one-day or Test.
[3] Similarly, Test teams sometimes deploy a nightwatchman during the closing session of a day so as not to lose important wickets in conditions that might be difficult for an incoming batsman to manage.