This question already has an answer here:

I am from Saudi Arabia travelling to the USA with a valid visa. Can I stay overnight in London? Do I have to take my checked luggage or can it be left at the airport for the next days flight?

marked as duplicate by Traveller, Rory Alsop, MJeffryes, CMaster, Giorgio Mar 21 at 13:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • It doesn’t seem like the linked duplicate addresses these questions. – Zach Lipton Mar 21 at 10:09
  • @ZachLipton If OP uses the visa tool linked by the other answer, they will be told that they are eligible for transit without visa since they are traveling to the US. This conclusively answers the transit question. – MJeffryes Mar 21 at 12:25
  • 1
    @MJeffryes: But the part that asks (IIUC) if he can check is baggage through for an overnight layover is not answered there. – Henning Makholm Mar 21 at 13:22
  • That's one of the reasons not to ask many questions in one post. The questions should be edited and after that it could be reopened. – Dirty-flow Mar 22 at 6:54

The duplicate target suggested in comments should give you the answer you need for the visa part.

As for not collecting your checked baggage, you will need to ask the airline if they will agree to check your baggage through to the US destination even across an overnight layover in London. Usually airlines don't do that, but there might be a chance if it's a tight late-night-to-early-morning connection. Call the airline and ask them. Or ask nicely when you check in and be prepared for either outcome.

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