Body aches; Slept for almost 36 hours; Very very thirsty; Fever; highest temperature at 102-103F/he still had fever; Balance and equilibrium problem like he was tipsy; Big knot at the injection site; This spontaneous case was reported by a consumer and describes the occurrence of BALANCE DISORDER (Balance and equilibrium problem like he was tipsy), HYPERSOMNIA (Slept for almost 36 hours), THIRST (Very very thirsty), VACCINATION SITE MASS (Big knot at the injection site) and MYALGIA (Body aches) in a male patient of an unknown age who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COVID-19 (Patient was admitted and on ventilator, patient waited 10 months before he got the 1st dose of the Moderna) from 23-Dec-2020 to 14-Feb-2021.    On 21-Oct-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 21-Oct-2021, the patient experienced BALANCE DISORDER (Balance and equilibrium problem like he was tipsy) and PYREXIA (Fever; highest temperature at 102-103F/he still had fever). On 22-Oct-2021, the patient experienced HYPERSOMNIA (Slept for almost 36 hours) and THIRST (Very very thirsty). On 23-Oct-2021, the patient experienced MYALGIA (Body aches). On an unknown date, the patient experienced VACCINATION SITE MASS (Big knot at the injection site). The patient was treated with PARACETAMOL (TYLENOL [PARACETAMOL]) for Fever, at an unspecified dose and frequency. At the time of the report, BALANCE DISORDER (Balance and equilibrium problem like he was tipsy), HYPERSOMNIA (Slept for almost 36 hours), THIRST (Very very thirsty) and MYALGIA (Body aches) outcome was unknown, VACCINATION SITE MASS (Big knot at the injection site) had resolved and PYREXIA (Fever; highest temperature at 102-103F/he still had fever) was resolving.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 21-Oct-2021, Body temperature: 102-103f (High) highest temperature at 102-103F. On 22-Oct-2021, Oxygen saturation: 84 (Low) oxygen dropped to 84. On an unknown date, Body temperature: 99-100f (High) fever resolved a little bit - his temperature now ranges from 99-100F. On an unknown date, Heart rate: 115 (High) heart rate was  at 115 pretty much the whole time..     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Concomitant product use was not provided by the reporter.  On 22 Oct 2021, patient oxygen dropped to 84. It was reported that they put patient on the oxygen concentrator and patient slept for almost 36 hours.  On 23 Oct 2021, the patient was again put on oxygen concentrator.  This case concerns a male patient of unknown age with no relevant medical history, who experienced the unexpected non-serious AESI of Hypersomnia. The event occurred on the day after the first dose of mRNA-1273 vaccine. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.; Sender's Comments: This case concerns a male patient of unknown age with no relevant medical history, who experienced the unexpected non-serious AESI of Hypersomnia. The event occurred on the day after the first dose of mRNA-1273 vaccine. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.