Good question Laurad
My Tomatoes are doing exactly the same. Two varieties in grow-bags in greenhouse.
According to Dr Hessayon leaf roll in tomatoes does not indicate disease.
In young leaves, provided they are dark green, this is taken as a good sign. In the older leaves it is possibly due to wide variations in day and night temperatures. Basically, if pests and disease are abscent there is no need to take any further action.
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Regards
Eddie 
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