At 4pm today I went upstairs for a bath, I suddenly felt unwell, my wife brought my meter and I registered a 2.2 and was dripping with sweat. I drank a small bottle of lucozade & 2 glucose tablets but fell asleep for hours. My levels are normally around 8-12 but recently my levels have been dropping at night to around 3-4. Should I be concerned about this. Thank you