''sun poking its head round the curtain'' just means the sun is coming through the clouds, in this context it's as though she's been up all night doing coke and she can see the sun coming out meaning its morning and she wants to go home cos she's not enjoying it
''sun poking its head round the curtain'' just means the sun is coming through the clouds, in this context it's as though she's been up all night doing coke and she can see the sun coming out meaning its morning and she wants to go home cos she's not enjoying it