Sleepy after eating dense protein

I am so sleepy after eating dense protein, especially chicken.   I wish my day was structured that I could take a siesta after my meal but I don't have the time to take a nap everyday.  This is not carb related.  I don't have this problem with protein shakes. 

My surgeon says it is normal and time will take it away. 

I am 5 months out and 4 lbs from goal. 

Anyone else have this problem?  

Anyone know how to make it go away?
 
Would love your feedback. 

K

Forgot to mention that my labs are recent and all numbers are good.  I get at B-12 shot monthly and take my multi's daily.