In other words, don't try to conquer tiredness and fatigue - they are natural at this point. Tiredness, by itself, is not an emergency. However, some other symptoms that may occur in combination with tiredness are serious. When these symptoms occur, you should get immediate help. Dizziness, or feeling a loss of balance, can happen when walking, getting out of bed, or going from a standing to a sitting position.
Dizziness can also occur without moving or changing one's position.
This symptom can happen to anyone occasionally. When it is severe and frequent, you should get medical help. Falling followed by an injury, bleeding, mental confusion, or unconsciousness. Report all bad falls so the doctor or nurse can judge what caused the fall, whether bones were broken, and what follow-up is needed. Sometimes they'll recommend using equipment for safety reasons.