And the general rule of thumb is if you've been trying to fall asleep and it's been 25 minutes or so, or you've woken up and you can't get back to sleep after 25 minutes, the recommendation is to get out of bed and go and do something different.
Y la regla general: si llevas unos 25 minutos intentando dormirte, o te has despertado y no puedes volver a dormirte luego de unos 25 minutos, el consejo es que te levantes de la cama y hagas algo diferente.