UK National minimum wage and sleep-in shifts
This is a presentation by HMRC which outlines different scenarios to help determine if the minimum wage is applicable to some or all hours worked during a sleep-in shift.
Hope that gave you some ideas about the national minimum wage when it comes to sleep in shifts.
You can use the minimum wage calculator to check the National Minimum Wage or National Living Wage is being paid at your company for your staff. Or if you are an employee check if you are paid the UK national minimum wage.