Bit tongue while sleeping. Was red and then slowly turned kinda white and now off yellow. Third day since bite. Right near teeth. Any concerns?

Quite common. In most cases, a tongue bite cures within a week or two on its own. The tongue biting during sleep has been reported as a common symptom in association with night bruxism. The custom night guard can be designed and fabricated by your dentist to prevent jaw closings during sleep, therefore preventing tongue injury.
Keep it Clean. It doesn't sound like you did too much damage. It should heal in the next week or so. Watch for swelling, pus, heat, pain and a foul taste that would indicate infection. If that occurs, see your dentist.In the meanwhile, keep it clean.