cramping, tingling pains in the legs; serious sleep disturbances; cramping, tingling pains in the legs; this is a spontaneous report received from a contactable reporter(s) (other hcp) from the regulatory authority-web. a 39 year-old female patient received bnt162b2 (comirnaty), administered in arm left, administration date 29nov2021 (batch/lot number: unknown) as dose 1, single for covid-19 immunisation. relevant medical history included: "food allergy" (unknown if ongoing); "pollen allergy" (unknown if ongoing); "allergy to chemicals" (unknown if ongoing), notes: allergy to nickel. the patient's concomitant medications were not reported. the following information was reported: pain in extremity (medically significant), muscle spasms (non-serious), outcome "unknown" and all described as "cramping, tingling pains in the legs"; sleep disorder (medically significant), outcome "unknown", described as "serious sleep disturbances". therapeutic measures were taken as a result of pain in extremity, sleep disorder, muscle spasms. additional information: after second dose accentuation of symptoms already verified after 1 dose: cramping, tingling pains in the legs and serious sleep disturbances. she took polase and melatonin. symptoms still present today. it has no relevant pathologies to report except allergy to nickel pollen and some foods. no follow-up attempts are possible; information about lot/batch number cannot be obtained. no further information is expected.; sender's comments: linked report(s) : it-pfizer inc-202200066795 same patient, same suspect different dose