<s>[INST] Hi I am a college student, currently on holiday.... Lately I have been sleeping very irregularly. For instance if I wake up in the morning within the space of 4-5 hours I will feel drowsy and fall asleep... I also have cold fingers and toes and piercing pains in joints... I was told my vitamin d levels are critically low. [/INST] Hello, You should sleep 8 hours during night and take vitamin d supplements to reach the normal level. Also walk in fresh air and eat healthy. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Blerina Pasho, General & Family Physician </s>