Frost? When it's cold some plants go limp to protect themselves and then perk up as it warms up.
Thirst? It's been very dry in some places so if the droopiness persists all day, water them.
If it is thirst, make sure you water in the morning after all frosts have gone so the plants have time to absorb all they need before nightfall and more frosts.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Are they in full sun? It may be cold first thing in the morning and all night but some plants can wilt when the sun hits them, especially as it has been dry in many places.
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Thirst? It's been very dry in some places so if the droopiness persists all day, water them.
If it is thirst, make sure you water in the morning after all frosts have gone so the plants have time to absorb all they need before nightfall and more frosts.