Blood Glucose of 40

Around midnight last night I got out of bed to test my blood sugar.  I was lying in bed reading when I realized that my heart was racing and my tongue felt fuzzy and my lips were tingling. I wasn't shaky or light headed at all, though, (my typical crash symptoms) so I wasn't expecting a low count - I was just curious and wanted to know what it was. A blood glucose count of 40 surprised and