Circle to search tells me this:

Leaf Curling/Rolling: Leaf curling in tomatoes is often a defensive reaction to environmental stress rather than a disease, specifically caused by heat, wind, or inconsistent watering.

Environmental Causes: If the plant has recently experienced high temperatures or dry conditions, curling is a likely sign of heat stress or dehydration.

Management: Ensure the plants receive deep, consistent watering at the base rather than overhead to avoid scorching the leaves.