Bedtime 9pm, sleep chart start after midnight, but not true, any adjustment? (Inspire HR)

[Qmavam]

I go to bed at 9pm and my sleep activity always starts after midnight. I have to say I'm only 4 nights into Fitbit use. Often I go to bed and get an hour of (good?) sleep before I wake up. This has not been  recorded.

Is there something I need to adjust with the Fitbit?

Also, I have not got any Estimated Oxygen Variation info in 4 days I have worn it.

 How do I fix that?

                                           Thanks, for your input,.

[JohnnyRow]

Depending on how long you wake up for before midnight, that sleep might be counted for the previous day.  Have you checked to see if that is the case?

[Qmavam]

Oh, very good, Yes, I now see I was asleep at 8:42 had a 2 minute restless period and then awoke at 9:48. Then another Asleep period from 10:53 to 11:53.  Thanks!

Is There a way to change the data so it starts the chart at 9pm rather than midnight? (in real time, not after the fact)

[JohnnyRow]

Sorry, but no. That cannot be adjusted.  Sleep is always credited to the day you wake up, so if you are awake long enough before midnight for fitbit to consider it a separate sleep session, it gets credited to that previous day.

[Qmavam]

Does that mean if I sleep from 10pm to 1am that the sleep graph will start before midnight?

 Second question,

Why hasn't my Estimated Oxygen Variation sensor given me any data? (no graph)

[JohnnyRow]

---

@Qmavam wrote:

Does that mean if I sleep from 10pm to 1am that the sleep graph will start before midnight?

Yes

 Second question,

Why hasn't my Estimated Oxygen Variation sensor given me any data? (no graph)

No idea - sorry.

---

[Qmavam]

Thanks for all your input, JohnnyRow.