Before going further, please ensure that your Standing Orders (certified) permit the engagement of trainees during the night. An apprentice engaged under the Apprentice Act is not expected to work night shifts. In the case of such apprentices, any action initiated should have the permission of the Apprentice Adviser, Related Instruction Centre, or Central Apprentice Board. Therefore, if they do something wrong during a night shift, you cannot take action against them.
Regards,
Madhu.T.K