FAM users--tracking BBT while breastfeeding

Sunny

My husband and I used FAM and withdrawal successfully for 1.5 years. Now we have a 10 month old who breastfeeds and I'm having the hardest time getting back to tracking my cycles. I don't get 4 hours of sleep at a time, so I doubt know if tracking my bbt will be reliable, which makes me sad, because that was what I relied on the most. Have any if you mom's figured out how to track with a breastfed baby?