Thank you for posting your query at DoctorSpring.com.
If these events are occasional, then, there is no need to worry about them. Specially, if you were tired or fatigued or sleep deprived, then, these may happen. However, if these events happened when you were relaxed and had a good sleep the previous night, of if the frequency is increasing, then, it would require evaluation.
You may require MRI brain, serum vitamin B12 level and thyroid profile after consulting a neurologist.
I hope it helps. Please get back if you have any follow up queries.
Dr. Sudhir Kumar MD (Medicine), DM (Neurology)
Senior Consultant Neurologist