Over night wait ...just checking (perhaps the obvious)

Hi all,
When connecting from Dublin in Lhr and there is an overnight wait (from Expedia) I assume that means I leave the airport and return the next day ... What happens about baggage?
Do I then check in for the VA flight as if it was a brand new flight?
Pondering choices for the summer and would appreciate advice.
Many thanks
Sam
When connecting from Dublin in Lhr and there is an overnight wait (from Expedia) I assume that means I leave the airport and return the next day ... What happens about baggage?
Do I then check in for the VA flight as if it was a brand new flight?
Pondering choices for the summer and would appreciate advice.
Many thanks
Sam