Here are some asanas that help this annoying problem:
Padmasana

Vrikshasana

Dhanurasana

Sharvangasana

Baddha Konasana

1. Yamas - ethical observation
2. Niyamas - self observations
3. Asanas - physical postures
4. Pranayama - observing breath
5. Pratyahara - controlling senses
6. Dharana - contemplation
7. Dhyana - meditation
8. Samadhi - absorption into the Universal