Firstly, please ensure you have your sleepover shifts set up correctly in the system.
To do this go to Masters > Allocation Master > Member Shifts.
Set up your Sleep over shift.
If you are wanting to have an actual allowance code you will need to update this within the master in finance -How to create/edit an Allowance.
Then you will need to add it to the rate table so it auto attaches to that sleepover shift type - Allowances within Rate Tables
Then I would suggest to review your awards to ensure they split it well - Using Awards to Process Sleepovers
If you have any more questions regarding sleepovers, please contact support - support@xeople.com