We've just had a new arrival - a little boy, now 7 days old. During the day, he sleeps peacefully for hours without any issues. However, when night falls, he becomes restless and refuses to settle down, crying and wriggling uncomfortably. This pattern only occurs at night, and we suspect it may be colic. Why does this happen only at night? Is there anything we can do to recreate the daytime conditions and help him sleep better at night?