1-<span>auxins in the lower sides of stems cause cell elongation that bends the stem upright
2-</span><span>thigmotropism.
3-</span><span>phototropic and gravitropic
4-</span><span>the production of anthocyanin and the breakdown of chlorophyll.
5-</span><span>exposing the plant to a brief period of light in the middle of the night</span>
I believe it is because the sun is directly over us which cause more heat since it is beating down. be sure to get a second opinion