ANSWER:

You should say it immediately after waking up. 

How long after waking up can you say dua la ilaha illahu wahdahu la shareeka lahu lahul mulku wa lahul hamdu wa huwa ala kulli shayin qadeer. Subhanallah walhamdulillah wa la ilaha illahu wallahu akbar wa la hawla wa la quwwati illa billahil aliyyil adheem. Rabbighfirli? Or dua for forgiveness after suddenly waking up?

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