Its a streaming service so getting up at 1am is unlikely and not what they are expecting people to do. Remember Britbox is a North American service. Not just USA. Emmerdale, Corrie, Eastenders etc are all same-day posted to the service around 4pm ET. So likely after GMB and This morning have gone out they will then be posted several hours later to the service most likely 7 or 6am ET time for people to watch when they get up. Though BritBox has live streamed some programmes. Royal Wedding, the Edinburgh Tattoo etc.
I said what I said!