Stimulation before bed -> anxiety next morning ??

Hello I've started using this US 2000 device since about a week on my neck. I tried different intensities and settled on "low". It definitely helps me sleep, and I feel more relaxed (nothing more) after using it. However the next morning when I wake up I feel a lot of unexplainable "anxiety" or "fear". This occurs whether I sleep 8 or 10 hours. Could it be that my sympathetic nervous system is rebounding to re-establish balance the next morning ? I am aged 26yo.

Any ideas ?

Should I just keep using it for the month ?

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