pkpk was crying last night and now her eyes are swelled up.  Tears are strange; you cry when you're happy and when you're sad.  This discussion of tears reveals a terrifying plot!
If you were that tired, 
you should've just gone to sleep.
Si estabas tan cansada, debiste irte a dormir.
Si estabas tan cansada, ¿por qué no te fuiste a dormir?
Se você estiver tão cansada
 assim, seria melhor dormir logo.