thank you to both of you for you responses. i was thinking in the way you two were thinking in that the plant was just tired and wanted to relax. i like to think that way about my plants, but just wanted to make sure there was not 'green thumb' no no i wasn't thinking about.

one more question though, the top leaves (biggest plant 20 inches from 400W HPS light and smaller one 30 inches away) of both plants seem to have a very very slight tint of a darker green... is that too much light? should i put glass between the light and plant to let the light through but block some of the heat? thanks