Could you post screenshots of your HR graph and the sleep diagram from GC Web (not GC Mobile!) - both for the same night? When taking the HR graph, select first the period of your sleep with the mouse - the graph will then reload with just the selected period, and the details will be better visible. At the sleep diagram, click the gray button Movement under the diagram, so that we can see the movement curve too.
From last night about an hour apart
This is a completely different issue than the one in the opening post, so it is off-topic here. I invite you to continue in this thread instead, to avoid mixing different irrelevant issues into an existing thread.