About 12 hours later patient woke up with cold; About 12 hours later patient woke up with sinus pressure; wouldn't be able to move anything; The current pseudo exacerbation was described as he can move his arms around and talk rationally, but he can't sit or stand. 07-Oct-2023, he fell and now can't get up again.; Squirrely in the brain; About 12 hours later patient woke up with chills; About 12 hours later patient woke up with headache; This spontaneous case was reported by a consumer and describes the occurrence of NASOPHARYNGITIS (About 12 hours later patient woke up with cold), PARANASAL SINUS DISCOMFORT (About 12 hours later patient woke up with sinus pressure), MOVEMENT DISORDER (wouldn't be able to move anything), DYSSTASIA (The current pseudo exacerbation was described as he can move his arms around and talk rationally, but he can't sit or stand. 07-Oct-2023, he fell and now can't get up again.) and TACHYPHRENIA (Squirrely in the brain) in an 84-year-old male patient who received mRNA-1273.815 (SPIKEVAX 2023-2024) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Rheumatic fever. Concurrent medical conditions included MS, Seizures, Sleep disorder (Sleep 15-16 hours a day) and Leg spasm. Concomitant products included TIZANIDINE, MODAFINIL and LEVETIRACETAM (KEPRA) for an unknown indication.    On 03-Oct-2023, the patient received dose of mRNA-1273.815 (SPIKEVAX 2023-2024) (unknown route) 1 dosage form. In October 2023, the patient experienced NASOPHARYNGITIS (About 12 hours later patient woke up with cold), PARANASAL SINUS DISCOMFORT (About 12 hours later patient woke up with sinus pressure), CHILLS (About 12 hours later patient woke up with chills) and HEADACHE (About 12 hours later patient woke up with headache). October 2023, the patient experienced MOVEMENT DISORDER (wouldn't be able to move anything), DYSSTASIA (The current pseudo exacerbation was described as he can move his arms around and talk rationally, but he can't sit or stand. 07-Oct-2023, he fell and now can't get up again.) and TACHYPHRENIA (Squirrely in the brain). At the time of the report, NASOPHARYNGITIS (About 12 hours later patient woke up with cold), PARANASAL SINUS DISCOMFORT (About 12 hours later patient woke up with sinus pressure), MOVEMENT DISORDER (wouldn't be able to move anything), DYSSTASIA (The current pseudo exacerbation was described as he can move his arms around and talk rationally, but he can't sit or stand. 07-Oct-2023, he fell and now can't get up again.), TACHYPHRENIA (Squirrely in the brain), CHILLS (About 12 hours later patient woke up with chills) and HEADACHE (About 12 hours later patient woke up with headache) outcome was unknown.            Concomitant medication use information was not provided by reporter.  On 03-oct-2023, it was reported that about 12 hours later patient woke up with cold, chills, sinus pressure and headache. The patient's reaction was different. On 04 October 2023, beginning the next morning patient experienced a little headache and a pseudo exacerbation. Squirrely in the brain and would not be able to move anything. The current pseudo exacerbation was described as patient could move his arms around and talk rationally, but he could not sit or stand. On 07 October 2023, Patient fell and now could not get up again.  Treatment medication use information was not provided by reporter.