I have only gotten that low in the middle of the night so I don’t really notice, but I get symptoms at about 70 and I am a mess for hours after. It is something you just can’t make a non-diabetic understand. My hubby tries to be understanding when I am so exhausted but he just doesn’t get how bad it feels.
Every time for me and it always makes me lethargic. Hate it. 
Tired, ill at the world name it! After a reading that gets that low or lower all I want to do is go to sleep!
I sleep all day after a low it is like my body had to work so hard to get my sugar back up that it needs sleep.
Oh yes, I feel like I’ve been run over by a truck. Its worst in the morning, nothing like waking up low. Makes the whole day kind of cruddy.