When plants are grown indoors or in other low light situations, they undergo a process called etioliation. This is elongation of the stem as the plant stretches upward to catch more light.
Correspondingly, how do you tell if your succulent is stressed?
Basically, observe the plant. If it’s leaves are margined or tipped in red, it’s a likely prospect. But if excess heat, sun or cold makes its tips shrivel and turn beigey-gray, it’s suffering.