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Fom you history it sounds that you might have a bedbug infestation. The bites from these insects might explain why both you and your husband have a scattered itchy rash. This would fit with feeling more itchy while in bed. You might carefully examine the inseam margins on your mattress and bedding.
Over the counter Zyrtec or Benadryl may help reduce itching
Other causes are possible for rash. I would explore the possibility of bedbugs.(they are small but big enough to be seen.) If present you may get the help of an exterminator.
Other causes of the rash are possible and if not bedbugs you may have benefit to be examined by dermatologist
I hope that this information is helpful for you.Let me know if you have further questions.I will be happy to get back with you.If my answers have been helpful and to your satisfaction then please remember to leave positive feedback.Thank you and Best Regards,
Anthony Bray MD
PS- I realize that you have looked such as for fleas and vaccumed the bed but these tiny insects do tend to hide during the day and may crawl up into crevices along the mattress....