lower extremity weakness; difficulty walking; tried to get up in the middle of the night and fell/ fell again a couple nights later; sleeping more than usual; This spontaneous case was reported by an other health care professional and describes the occurrence of MUSCULAR WEAKNESS (lower extremity weakness), GAIT DISTURBANCE (difficulty walking), FALL (tried to get up in the middle of the night and fell/ fell again a couple nights later) and SOMNOLENCE (sleeping more than usual) in an 85-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     Concurrent medical conditions included Dementia.   On 18-Apr-2022, the patient received fourth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form and first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In April 2022, the patient experienced FALL (tried to get up in the middle of the night and fell/ fell again a couple nights later) and SOMNOLENCE (sleeping more than usual). On 23-Apr-2022, the patient experienced MUSCULAR WEAKNESS (lower extremity weakness) and GAIT DISTURBANCE (difficulty walking). At the time of the report, MUSCULAR WEAKNESS (lower extremity weakness), GAIT DISTURBANCE (difficulty walking), FALL (tried to get up in the middle of the night and fell/ fell again a couple nights later) and SOMNOLENCE (sleeping more than usual) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In April 2022, Blood test: normal (normal) unremarkable blood test. In April 2022, Urine analysis: normal (normal) unremarkable urine test.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant medication information was provided.  Reporter was patient's daughter. Patient had not experienced any symptoms after the first 3 doses of the vaccine.  It does not look like Guillain-Barre, as the patient not had pain and sensation was intact. Patient received 4 doses of the Moderna covid-19 vaccine and 5 days after receiving 4th vaccine, patient had experienced lower extremity weakness, difficulty walking, and had been sleeping more than usual. Patient tried to get up in the middle of the night and fell. Emergency medical services was called and was taken to the emergency room where the patient had unremarkable blood and urine tests and was sent home.  Patient fell again a couple nights later and emergency medical services was called again.  They did not take the patient back to the emergency room, however recommended to see the general practitioner.  Reporter was going to take patient to doctor on 25Apr2022 after the reporting call. No treatment medication were provided.   Most recent FOLLOW-UP information incorporated above includes: On 25-Apr-2022: Follow up contains non significant information. Reporter's email address updated.