To have good posture, when you are dreaming, has the symbolic significance of trust and confidence. It suggests the belief that you can rely yourself. If your posture is noticeably bad, then it stands as a symbol for a lack of confidence or low self esteem. You are feeling unsure of yourself.
Dream dictionary: Posture dream meanings
Having good posture in a dream represents confidence and power. Dreaming that you have poor posture suggests that you have low self-esteem.
…[arb. Testimonial greetings) The last segment of the regular Islamic prayers which is recited in a sitting posture. Once completed, one may ask for his personal needs or pray for others. If one reaches this segment of his prayer in a dream, it represents a condition or an agreement that must be fulfilled between two partners, or it could mean finding a guardian for one’s intended wife (i.e., her father, uncle, brother, etcetera), without whom the marriage is not legitimate. Reciting the Tahayyat in a dream also means bartering material property for spiritual gains….
…(arb. Tashahhud) A sitting posture during one’s prayers which includes the proclamation of God’s oneness (i.e., I bear witness that God is one, no associate has He, and I bear witness that Muhammad is His servant and Messenger.) To see oneself offering the testimony of faith in a dream means the lifting of his adversities and achievement of his goals….
…material or spiritual realms. If one looks toward the sky, whether to the East or to the West in a dream, it means travels. If one sees himself stealing the sky and hiding it in ajar in a dream, it means that he may steal a copy of the holy Qur’an and hides it with his wife. If one sees the sky wide open in a dream, it means blessings and benefits. If one sees himself rising toward the sky in a flat posture in a dream, it means that he will become emaciated, or suffer losses in his business. On the other hand, if one sees himself rising without difficulty and without being laid on his back in a dream, it means exaltation, success and safety from any harm that could be driven by one’s enemies. If one bites the sky in a dream, it means that a calamity…