That's the advantage to having one large meal in the evening time after your day is pretty much complete. You can pretty much afford to rest and/or sleep after you eat. But then again, the "warrior diet" isn't for everyone. I recommend not eating the meal until you don't have anything much else to do for the day because you WILL get sleepy.
For me a heavy meal in the evening has the opposite effect. I may feel drowsy soon afterwards, but that passes and I end up wound until 3am.